I got problems with my account, so I don«t know if this email was previously send OK. Here it goes again: I want to build an "Arbitrary Function Generator" around a Maxim 12bits DAC, with a 12bit uP interface. I also want to generate a hardware interrupt with an external circuit as to have a precision time base. I have everything, but I don«t know how many hardware interrupts a second a PC with an AMD586DX133mhz can handle. The programming languaje is Turbo Pascal 6.0 under DOS. I need help!! Gabriel, de La Plata